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Texas Instruments LM2597HVN-ADJ
- Part No.:
- LM2597HVN-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2597HVN-ADJ.pdf
- Description:
- IC REG BUCK ADJ 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,323
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Product details
Overview
LM2597HVN-ADJ from Texas Instruments is a monolithic step-down (buck) switching voltage regulator IC delivering 0.5A output current with adjustable output voltage from 1.2V to 37V (±4% tolerance), operating at a fixed 150 kHz switching frequency, and supporting input voltages up to 60V - used in industrial power supplies, battery-powered systems, and distributed DC-DC conversion.
For engineers reviewing the LM2597HVN-ADJ datasheet, LM2597HVN-ADJ pinout, LM2597HVN-ADJ application, or LM2597HVN-ADJ equivalent, key selection criteria include its HV input capability (60V max), internal soft-start/shutdown control, feedback reference voltage (1.230 V), thermal shutdown protection, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2597HVN-ADJ implements a current-mode PWM buck controller with integrated 0.5A N-channel DMOS switch, fixed-frequency oscillator (150 kHz), and internal compensation. It uses a resistor-divider feedback network (VFB = 1.230 V) to set output voltage and features cycle-by-cycle current limiting and thermal shutdown for fault protection.
Its bias supply pin (VBS) improves efficiency at high input voltages by powering internal circuitry independently of VIN, while the error flag (FLAG) pin provides regulated dropout detection with programmable delay via an external capacitor on the DELAY pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 0.5A continuous - supports mid-power DC-DC conversion without external pass devices |
| Input Voltage Range | 4.5V to 60V - enables direct regulation from 48V telecom, automotive, or industrial bus rails |
| Output Voltage Range | 1.2V to 37V (adjustable via R1/R2 divider) - covers wide range of system rail requirements |
| Feedback Reference | 1.230 V ±3.3% - sets precision output with minimal external component drift sensitivity |
| Switching Frequency | 150 kHz (±15%) - allows use of compact, low-cost magnetic components and reduces EMI filtering burden |
| Quiescent Current | 140 μA typical in shutdown - enables ultra-low standby power in battery-backed applications |
| Efficiency | 80% at 12VIN/3VOUT/0.5A - delivers high conversion efficiency without synchronous rectification |
Pinout & Package
LM2597HVN-ADJ is housed in an 8-pin SOIC (D) package (Package Number D0008A), with exposed pad for thermal enhancement. Pin functions are validated per TI SNVS119C datasheet Figure 3 and Table "Pin Functions".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 4.5–60V DC; requires local 47–100μF low-ESR input capacitor |
| OUT | Switch Node | Drives external catch diode and inductor; high dv/dt node requiring careful layout |
| GND | Power & Signal Ground | Common return for internal switch, feedback, and control circuits; must be low-impedance |
| FB | Feedback Input | Senses output via resistor divider; 1.230 V reference sets VOUT = 1.23 × (1 + R1/R2) |
| SD/SS | Shutdown/Soft-Start Control | Pulled low for shutdown (ISTBY ≈ 140 μA); ramped for controlled soft-start |
| FLAG | Error Flag Output | Open-collector active-low signal indicating >4% output undervoltage or regulation loss |
| DELAY | Flag Delay Timing | Connects to capacitor to set flag assertion delay (e.g., 10 ms with 100 nF) |
| VBS | Bias Supply Input | Provides dedicated 3–30V supply for internal logic; improves efficiency above 25VIN |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.5A DMOS Switch | Eliminates need for external MOSFET and gate driver; simplifies BOM and layout |
| 150 kHz Fixed-Frequency Operation | Enables predictable EMI spectrum and use of standardized, low-cost inductors |
| VBS Bias Supply Pin | Reduces power loss in high-VIN operation by decoupling internal bias from main input rail |
| Programmable FLAG Delay | Prevents false fault triggering during transient load steps or startup via external capacitor |
| Thermal Shutdown + Current Limit | Two-stage protection ensures safe operation under overload, short-circuit, or poor heatsinking |
Applications
| Industrial 24V/48V DC-DC Conversion | Automotive Body Control Module (BCM) Power |
|---|---|
Use Scenario: Converting 48V battery or PoE++ supply to 3.3V/5V for microcontrollers and sensors in factory automation I/O modules. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing stable, efficient intermediate rail generation. Use Value: Supports 60V input rating and 0.5A output to replace discrete solutions while maintaining thermal margin on standard PCB copper. | Use Scenario: Regulating vehicle battery (9–16V nominal, up to 40V load dump) to 5V for infotainment MCU and CAN transceivers. IC Role / Device Role / Timing Role: High-input-voltage buck converter with built-in fault flag for system diagnostics. Use Value: FLAG pin signals undervoltage events to host MCU; soft-start prevents inrush into downstream capacitive loads. |
| Portable Test Equipment Power | LED Driver Pre-regulator |
Use Scenario: Generating 12V and 3.3V rails from a single Li-ion (3.0–4.2V) or 2S pack using boost-buck architecture. IC Role / Device Role / Timing Role: Adjustable-output buck stage accepting boosted intermediate bus (e.g., 24V). Use Value: 1.2V–37V output range and 140 μA shutdown current extend battery runtime and support flexible rail configuration. | Use Scenario: Providing constant-current LED string drive with precise current regulation via external sense resistor and linear current sink. IC Role / Device Role / Timing Role: Efficient pre-regulator lowering input to just-above LED forward voltage, minimizing linear stage dissipation. Use Value: 80% efficiency at 12VIN/3VOUT reduces heat in enclosed enclosures; adjustable output matches varying LED VF across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596HV-ADJ | Higher 3A output current; same 60V input, 150 kHz, and adjustable output; larger SOIC-8 package (D2 package) | Supports higher load currents but requires larger inductor and output capacitor | Select when >0.5A output is needed and board space allows larger magnetics |
| TPS54202DRT | 2A synchronous buck; 6–17V input; 500 kHz switching; integrated high/low-side FETs; no VBS or FLAG pins | Lacks fault flag and high-voltage input capability; optimized for compact, high-efficiency 12V-input designs | Select for space-constrained 12V systems where efficiency >85% and footprint are critical |
Compared with LM2597HVN-ADJ, LM2596HV-ADJ scales output current at the cost of size and thermal mass, while TPS54202DRT trades HV input and diagnostic features for higher integration and efficiency at lower input voltages.
Availability
LM2597HVN-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and portable instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2597HVN-ADJ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and power management technologies, with over 50 years of leadership in power conversion ICs.
The LM2597/LM2597HV product line was designed for simple, robust, high-voltage DC-DC buck conversion in cost-sensitive industrial and automotive applications - emphasizing ease of design, reliability, and compatibility with standard passive components.
FAQ
What is the maximum input voltage supported by the LM2597HVN-ADJ?
The LM2597HVN-ADJ supports a maximum input voltage of 60V, as specified in the Absolute Maximum Ratings table of the TI SNVS119C datasheet. This HV rating distinguishes it from the standard LM2597 (45V max) and enables direct regulation from 48V industrial or telecom buses without pre-scaling.
How is the output voltage set on the LM2597HVN-ADJ?
The LM2597HVN-ADJ uses a resistor divider network connected to the FB pin to set output voltage. With a precise 1.230 V internal reference, VOUT = 1.23 × (1 + R1/R2). For example, R1 = 1 kΩ and R2 = 15.4 kΩ yields ~20V output. Resistor tolerance and temperature coefficient directly impact output accuracy.
Does the LM2597HVN-ADJ require an external catch diode?
Yes, the LM2597HVN-ADJ requires an external Schottky catch diode (e.g., 1N5817 or equivalent) connected between the OUT and GND pins. The IC integrates only the high-side switch; the diode provides the return path for inductor current during switch-off time and must handle ≥0.65A peak current and ≥1.25×VIN reverse voltage.
What is the purpose of the VBS pin on the LM2597HVN-ADJ?
The VBS pin on the LM2597HVN-ADJ supplies bias power to internal circuitry independently of VIN. When driven with 3–30V (e.g., from a local LDO), it reduces power dissipation in the internal regulator at high input voltages (>25V), improving overall efficiency and thermal performance without requiring additional external components.
Can the LM2597HVN-ADJ be synchronized to an external clock?
No, the LM2597HVN-ADJ cannot be synchronized to an external clock. It uses an internal fixed-frequency 150 kHz oscillator with ±15% tolerance. There is no SYNC, CLKIN, or frequency-adjust pin - making it unsuitable for noise-sensitive applications requiring clock synchronization or spread-spectrum modulation.
LM2597HVN-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 57V
- Current - Output:
- 500mA
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2597HVN-ADJ FAQ
1.How can I place an order for LM2597HVN-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2597HVN-ADJ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2597HVN-ADJ reliable?
The price and inventory of LM2597HVN-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2597HVN-ADJ is usually 5 days.
3.What payment methods are accepted for LM2597HVN-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597HVN-ADJ transactions.
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4.How is shipping managed for LM2597HVN-ADJ?
LM2597HVN-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2597HVN-ADJ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2597HVN-ADJ?
For technical support, including LM2597HVN-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597HVN-ADJ requirements.
6.How does Aetrix verify that LM2597HVN-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2597HVN-ADJ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2597HVN-ADJ meets industry standards.
7.What is the process for return or replacement of LM2597HVN-ADJ?
All LM2597HVN-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2597HVN-ADJ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2597HVN-ADJ part is unused and in its original packaging.
Return procedure for LM2597HVN-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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